Planoorapir



F. N. SIMMONDS.

COUNTERBORE.

APPLICATION FILED JAN. 1.8. 1918.

1,308,304. Patented July 1, 1919.

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To all whom itmagfconcerw:

Beit known hat I, FRANoIs N: SIMMONDS,

a citizen ofGreatBritain, residingat San Francisco, in the countyof san Francisco and Sta'te of California, have invented certain new and useful Improvements in I Coun terbores, of which the following is a spec fication, i

This invention relates to boring tools, and

used for counterboring purposes.

One of the main objects ofthe invention isto provide a tool of the character stated of simple construction and fopjeration in. which the cutting blade or element may be quickly and easily securedin or removed from the stock. 3A further objectis to" provide means for securing the :cutting bl'ade in the stock, this securing Imeansalso serving as a guide or post adapted to fit into a hole which has been bored so as to maintain the cutting blade in fixedrelation to this hole during the counter-sinking operation. Further objects will appear from the detailed description. y

In the drawings:

Figure 1 is a front view of a tool constructed in accordance with my invention.

Fig. 2 is a side view.

Fig. 3 is a detail of the cutting blade.

Fig. 4: is a detail of the securing pin.

Fig. 5 is a view similar to Fig. 2 of a modified form.

Fig. 6 is a similar view of another modiwhich is in the form of a rectangular plate a of steel. This cutter is provided at the cen ter of its lower edge with a substantially The pin rectangular cut-out or recess 6. 3 is placed with its arms 2 at each side of the cutter body 5 fitting snugly about the same, the portion of the body of the pin adjacent pp itely beveled t0 Sp t a e 1 I Patented July 1, 19119. i Applicationfiledlanuary 18,1918. Serial N6.212,4A752 1 the lowerend of slot 4;; fitting snuglyinto central recess 6. produces two depend ing spaced blades 9 l at the lower edge of cutter b; Thesebladest have their lower edges "provide oppositely directed cutting edges; By. placing the lower end o f pin Fina hole which hasbeen bored in a piece of material, and their rotating stool; 1,.the blade or cutting element 5will act. to cut aw ay the material contiguous to the hole so *as to provide a counterbored portiolr or recess. this means, acounterbore is provided which adapted to receive a screw or other securing" element 1 of the button-head type. Of course, if desired, by

havingftlle blades *beveled upwardly and outwardly from their inner corners a counter-sinlr for a flat headed screw may be proplished by forcing a tapered pin or wedge member through the diametrical slot 10 provided through stock 1 for this purpose, this slot being so positioned that the upper end of the cutter body 5 projects across the lower portion thereof, as in Figs. 1 and 2 of the drawings.

In the construction shown in Fig. 5, the arms 2* of the pin 3 are extended and provided with alined slots which receive a se curing key 11 and a wedge 12 inserted through the same and through diametrically alined slots provided through the stock 1 for thispurpose. By removing the wedge member 12 and key 11, the pin 8 and the plate 5 carried thereby may be readily removed from the stock. In Fig. 6, the elongated arms 2" of the pin 3 are provided with aliued slots, these slots being in aline ment with a slot 5 provided through the plate 5 and with diametrically alined slots 1 provided through the stock 1 a securing pin 12 being inserted through the alined slots of these elements. By this means, the

duced. When it is desired to remove the y blade is detachably secured in the stock. In Fig. 7 the arms 2 of the pin 3 are engaged by set screws 13 threaded into the stock 1 and in alinement axially diametrically thereof. By means of these screws, thepin 3 and plate 5 carried thereby may be readily secured in or removed from the stock.

It will be evident that there may be slight changes made in the construction and arrangement of the different parts of my invention without departing from the field and scope of the same, and I intend to include all such Variations, as fall within the scope of the appended claims in this application in which apreferred form only of my invention is disclosed.

What'I claim is:

1. In a tool of the character described, a stock having a tapering axial bore and diametrically alined slots communicating with said bore and extending axially of the stock from the lower end thereof, a tapered securing pin adapted to fit into said bore and being provided in its upper portion with an axially extending diametrical slot, and a cutter fitting snugly into the slots of said stock and pin, said cutter being provided with cutting edges on its outer projecting edges. I

2. In a tool of the character described, a stock having a tapering axial bore, a pin having spaced arms snugly fitted into said bore, and a cutter inserted between said arms of said pin, the outwardly projecting ends Copies of this patent may be obtained for of said cutter being provided with cutting edges.

3. In a tool of the character described, a stock having a tapering axial bore and diametrically alined slots communicating with said bore and extending axially of the slot from the lower end thereof, a tapered securing pin adapted to fit in said bore and being provided in its upward portion with diametrically extended slots adapted to register with the slots in the stock, a cutter snugly fitted in one of said slots of the pin and stock, and a fastening element extended through the other slots in said stock and pin.

4. In a tool of the character described, a stock having a tapering axial bore and .diametrically alined slots communicating with said bore and extending axially of the slot from the lower end thereof, a tapered securing pin adapted to fit in said bore and being provided in its upward portion with diametrically extended slots to register with the slots in the stock, a cutter snugly fitted in one of said slots of the pin and stock, and a wedge key insertible into the other slots of said pin and stock for maintaining said parts together.

In testimony whereof I aflix my signature in presence of two witnesses.

FRANCIS N. SIMMONDS.

lVitnesses:

WILSON LYFORD, GEO. C. GoE.

five cents each, by addressing the Commissioner of Patents, Washington, D. C. 

